mpack -- Pack a file in MIME format for mailing and news
http://www.ussg.iu.edu/usail/mail/mime/
The mpack program encodes the the named file in one or more MIME messages.
The resulting messages are mailed to one or more recipients, written
to a named file or set of files, or posted to a set of newsgroups.
Lighter than Metamail - unmaintained
About MIME: See RFC 1521 and RFC 1522. From:
http://ftp.andrew.cmu.edu/pub/mpack/